open: loads the sub document in an own frame. The return value of the execute method is the model of the loaded document.

store: stores the document.

openDesign: opens the sub document in an own frame, in design mode. The user can make changes to the document, and save those changes. The return value of the execute method is the model of the loaded document.

close: closes the sub document, if it had previously been opened using either the open or openDesign command. The return value of the execute command is a boolean value indicating whether the sub document could be closed. Reasons for not closing the document include vetoes by third parties, for instance, because the user opened a dialog modal to the sub document, or a long-running task such as printing is currently running.

show: shows the sub document. This is useful if you previously opened the document hidden, or if you previously hide it using the hide command.
The open command is not available if the sub document has not been loaded, yet.

hide: hides the sub document. In opposite to the close command, only the document window is hidden, but the document is kept loaded. A subsequent execution of the show command will show the window, again.